English verb conjugation
SHOULD VARY

Regular verb: vary - varied - varied

Affirmation

Simple form	V-ing form
I should vary you should vary he should vary we should vary you should vary they should vary	I should be varying you should be varying he should be varying we should be varying you should be varying they should be varying
Perfect	V-ing perfect
I should have varied you should have varied he should have varied we should have varied you should have varied they should have varied	I should have been varying you should have been varying he should have been varying we should have been varying you should have been varying they should have been varying

Negation

Simple form	V-ing form
I should not vary you should not vary he should not vary we should not vary you should not vary they should not vary	I should not be varying you should not be varying he should not be varying we should not be varying you should not be varying they should not be varying
Perfect	V-ing perfect
I should not have varied you should not have varied he should not have varied we should not have varied you should not have varied they should not have varied	I should not have been varying you should not have been varying he should not have been varying we should not have been varying you should not have been varying they should not have been varying

Interrogative form

Simple form	V-ing form
should I vary? should you vary? should he vary? should we vary? should you vary? should they vary?	should I be varying? should you be varying? should he be varying? should we be varying? should you be varying? should they be varying?
Perfect	V-ing perfect
should I have varied? should you have varied? should he have varied? should we have varied? should you have varied? should they have varied?	should I have been varying? should you have been varying? should he have been varying? should we have been varying? should you have been varying? should they have been varying?

Interro-negative form

Simple form	V-ing form
should I not vary? should you not vary? should he not vary? should we not vary? should you not vary? should they not vary?	should I not be varying? should you not be varying? should he not be varying? should we not be varying? should you not be varying? should they not be varying?
Perfect	V-ing perfect
should I not have varied? should you not have varied? should he not have varied? should we not have varied? should you not have varied? should they not have varied?	should I not have been varying? should you not have been varying? should he not have been varying? should we not have been varying? should you not have been varying? should they not have been varying?